Studies of Phase Diagram and Glass Transitions of a Liquid Crystal with Ferro- and Antiferroelectric Phases

Ł. Koleka, M. Massalska-Arodźa, D. Majdab, B. Suchodolskac and S. Zalewskic aInstitute of Nuclear Physics, Polish Academy of Sciences, E. Radzikowskiego 152, 31-342 Kraków, Poland bFaculty of Chemistry, Jagiellonian University, R. Ingardena 3, 30-060 Kraków, Poland cInstitute of Chemistry, Siedlce University of Natural Sciences and Humanities, 3-go Maja 54, 08-110 Siedlce, Poland

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Based on the results of the differential scanning calorimetry, of transmitted light intensity measurements and of texture observations the phase diagram of 4-(6-hepta-fluoro-butano-iloxy-hexy-loxy)bi-phenyl-4'-carbo-xy-late(S)-4-(methylo-hepty-loxy-1-carbonyl)-phenyl (4H6) was obtained. The following phases were identified on cooling: isotropic, smectic A, smectic C*, smectic C*A phases and a highly ordered phase called SmX and its glass. During heating transformation from glass of SmX to SmX phase and then transition to a metastable Cr2 phase, evolving to the more stable Cr1 phase, were observed. On further heating SmC*A, SmC* and Sm phases were identified. When Cr2 was cooled, a glass transition was also observed.

DOI: 10.12693/APhysPolA.124.909 PACS numbers: 64.70.kj, 64.70.mj, 64.70.pp